DESCRIPTIONS OF SOME GENERA AND SPECIES OF LEIODIDAE (COLEOPTERA)

1937 ◽  
Vol 69 (8) ◽  
pp. 170-174 ◽  
Author(s):  
W. J. Brown
Keyword(s):  
Abdominal Segment ◽  
Anterior Margin ◽  
Lateral Margin ◽  
Basal Margin

Male. Length 2.2 mm. Second and third antennal segments equal in length. Punctures of the pronotum evident, those of the elytral intervals very indistinct. Metasternum very indistinctly alutaceous near the lateral margin; the punctures fine and close at middle except on the impunctate area, a trifle coarser on the sides and there distinct but not deeply impressed, very closely placed, the punctures of the anterior margin like those of the disk. Each abdominal segment finely and closely punctate, without coarser punctures on the basal margin.

Phylogenetic relationships of Leuronectes Sharp (Coleoptera: Dytiscidae: Agabinae) based on larval morphology and chaetotaxy

2009 ◽  
Vol 40 (2) ◽  
pp. 209-228 ◽  
Author(s):  
Miguel Archangelsky ◽  
Mariano Michat
Keyword(s):  
Phylogenetic Relationships ◽  
Abdominal Segment ◽  
Anterior Margin ◽  
Cladistic Analysis ◽  
Lateral Margin ◽  
Larval Morphology ◽  
The Third ◽  
Segment Viii ◽  
First Time ◽  
Diving Beetle

AbstractThe phylogenetic relationships of the diving beetle (Dytiscidae) genus Leuronectes Sharp are revised based on a cladistic analysis of seven Agabinae genera and 54 morphological and chaetotaxic characters from larvae. For this purpose, larvae of L. curtulus Régimbart are described and illustrated in detail for the first time, with particular emphasis on morphometry and chaetotaxy. The results show that Leuronectes is well placed within Agabinae based on the absence of natatory setae on tibia and tarsus in instars II and III, the urogomphus composed of two urogomphomeres, and the absence of secondary setae on urogomphus. Leuronectes is resolved as part of a basal polytomy along with Platynectes Régimbart and a clade formed by the remaining agabine genera. Leuronectes shares with Platynectes the setae UR2, UR3 and UR4 not inserted contiguously, with Platambus Thomson the anterolateral lobes of frontoclypeus not projected beyond anterior margin, with Hydrotrupes Sharp the seta AB9 inserted dorsolaterally, and with Ilybius Erichson the seta LA10 inserted submedially. Leuronectes is unique within Agabinae in having the apical lateroventral process of the third antennomere not protruding and additional ventroapical pores on third antennomere, and is unique within the dytiscid genera studied in having the seta LA12 inserted submedially and one additional spine-like seta inserted on the lateral margin of abdominal segment VIII.

scholarly journals ENTOMOLOGICAL NOTES: DESCRIPTIONS OF FOUR NEW SPECIES OF CANADIAN HYMENOPTERA

1869 ◽  
Vol 1 (12) ◽  
pp. 103-105 ◽  
Author(s):  
E. T. Cresson
Keyword(s):  
New Species ◽  
Anterior Margin ◽  
Lateral Margin ◽  
Black Spots ◽  
Vertex Covering ◽  
Fourth Segment

Euceros Canadensis, n. sp.—Female. Shining : head yellow ; two spots behind antennæ, confluent with a mark on vertex, covering ocelli and occiput, and tips of mandibles, black; antennæ black, palish at base beneath; thorax black, lateral margin of mesothorax in front of tegulæ, two lines on disk, a spot on each side before scutellum, a broad V-shaped mark on scutellum, apex of metathorax, which has two black spots above, anterior margin of prothorax, a spot on each side of pleura, and the tegulæ, yellow; wings hyaline, dusky on apical malgin; legs yellow, anterior coxæ in front, posterioi coxæ,their femora, except base and apex,and their tibiæ, except base, black, their tarsi, except tips, fuscous; abdomen yellow; a triangular mark on each side of first segment, a transverse mark on each side of second and third segments, dilated laterally, and the remaining segments, except medial spot at tip of fourth segment, and another on extreme tip of abdomen, blackish; venter entirely yel1ow.—Length, 5¼ lines.

Two new species of idoteid isopods (Crustacea, Isopoda, Idoteidae) from Korea

Zootaxa ◽  
2020 ◽  
Vol 4858 (2) ◽  
pp. 186-200
Author(s):  
SUNG HOON KIM ◽  
TAE WON JUNG ◽  
SEONG MYEONG YOON
Keyword(s):  
New Species ◽  
Anterior Margin ◽  
The Body ◽  
Lateral Margin ◽  
Korean Waters ◽  
Two New Species ◽  
Lateral Margins

Two new species, Cleantiella ampliscutula sp. nov. and Pentias pluriarticulatus sp. nov., are reported from Korean waters with keys to all known species of the genera Cleantiella and Pentias. Cleantiella ampliscutula sp. nov. can be distinguished from its congeners by the following characteristics: the body is relatively small; pereonite 1 is expanded anterolaterally; coxal plates 2–7 are triangular; the pleon has three partial sutures; the pleotelson is widening posteriorly on the lateral margin; the flagellum of the antenna is single-articled; and the maxillipedal palps are four-articled. Pentias pluriarticulatus sp. nov. can be distinguishable from its congeners by the following characteristics: the lateral margins of the body are parallel; the anterior margin of the cephalon is slightly concave and has a small median notch; the coxal plates are invisible dorsally on pereonites 2–4, but visible on pereonites 5–7; the pleon has three partial sutures; the flagellum of the antenna is composed of nine articles; and the distal ends of the uropodal endopods are sinuous. 

A New Genus and Species of Capsidae (Heteroptera) from the Flowers of Cola acuminata in Sierra Leone

1927 ◽  
Vol 17 (3) ◽  
pp. 285-287 ◽  
Author(s):  
W. E. China
Keyword(s):  
Sierra Leone ◽  
Anterior Margin ◽  
New Genus ◽  
New Genus And Species ◽  
The Third ◽  
Basal Joint ◽  
Basal Margin ◽  
Full Face ◽  
Cola Acuminata

Very small, shining black, evenly, but rather sparsely covered with very regular, equally long, pale, short, depressed hairs.Head very strongly deflexed, including the eyes more than three times as broad as long, seen from above, but actually only a little more than one and a third times as broad as long seen in full face ; seen from the side (fig. 2, a) shorter than height at base ; frons and vertex moderately convexly arched, the vertex between the eyes about twice as wide as the diameter of one of the eyes (which are feebly prominent) ; basal margin of vertex between the eyes distinctly carinate, and slightly overlapping the anterior margin of pronotum ; clypeus flat, not at all prominent, and obscurely delimited from the frons ; rostrum extending to the hind coxae, the basal joint incrassate and reaching the base of the front coxae ; antennae moderately short, inserted close to the front margin of the eyes at about two-thirds of the distance from the base of the eye to its anterior apex, first joint slightly incrassate, cylindrical, extending to the apex of the clypeus, second joint incrassate more or less fusiform, the apex much thicker than the base, about three and a half times as long as the first joint, the third and fourth sub-equal, slightly thinner than, and about twice as long as, the first joint.

scholarly journals Morphometries of two Californian populations of Gumaga nigricula (McLachlan 1871) (Trichoptera: Sericostomatidae)

1969 ◽  
Vol 80 (3) ◽  
pp. 157-167
Author(s):  
Jorge A. Santiago-Blay
Keyword(s):  
Abdominal Segment ◽  
Anterior Margin ◽  
Length Ratio ◽  
Head Width ◽  
Genetic Isolation ◽  
Northern California ◽  
Meristic Characters ◽  
Segment Viii ◽  
Continuous Character

Eighty Gumaga nigricula larvae from Hopland Spring and Big Sulphur Creek, northern California, USA, were studied to quantify possible dissimilarities among them. The populations are statistically different in two meristic characters: number of setae on the anterior margin of the pronotum and number of pleural sclerites on abdominal segment VIII. They also appear to be different in a continuous character, head width/length ratio. In all cases, specimens from Big Sulphur Creek have statistically significant higher values. These data are congruent with the hypothesis that there is biologically significant genetic isolation between these populations.

Extent and properties of the regeneration field in the larval legs of cockroaches (Leucophaea maderae)

Development ◽  
1974 ◽  
Vol 32 (1) ◽  
pp. 69-79
Author(s):  
Horst Bohn
Keyword(s):  
Abdominal Segment ◽  
Anterior Margin ◽  
Posterior Border ◽  
Anterior Border ◽  
Leucophaea Maderae ◽  
Anterior Half ◽  
Regenerative Ability ◽  
Transplantation Experiments ◽  
Anterior Posterior

The investigation of the regeneration field of the larval legs of cockroaches (Leucophaea maderae), which commenced in a previous paper with extirpation experiments, has been continued by transplantation experiments. The extirpation experiments showed that there are two regions near the leg which are indispensable for leg regeneration: the basal sclerites, and the membranous region extending behind the leg up to the spiracle of the next segment, called ‘leg-inducing membrane’ (LIM). The LIM is followed by ‘sclerite-inducing membrane’ (SIM) which, upon contact with sclerites, only allows formation of sclerite structures. The results of the extirpation experiments have been confirmed by transplantation experiments. When the whole leg including the basal sclerites is removed, no leg regeneration occurs. The regenerative ability can be restored by implantation of part of the basal sclerites (for instance, the trochantin), but leg regeneration takes place only when the implantation area is covered by LIM. When the sclerites are transplanted to a region which is covered by SIM only additional basal sclerites are formed. Whole sets of basal sclerites have been implanted at different distances behind the uninjured hindleg. Additional legs are regenerated only in the anterior half of the membranous field extending between the hindleg and the first abdominal segment. Thus, there is adistribution of LIM and SIM in the region of the hindleg, similar to that near the midleg. Whole sets of basal sclerites have been implanted at various sites on the dorsal or ventral surfaces of the abdomen. Legs are formed on both surfaces, but only when the transplanted sclerites contact the intersegmental membranes. This means that the intersegmental membranes of the abdomen also have leg-inducing capacities. The implantation of a trochantin into a field of LIM is followed by the development of two regenerates - a normal one at the posterior border of the field, and one with reverse anterior-posterior polarity at the anterior border. When the trochantin is transplantedtogether with the praecoxa in a similar way, only one normal regenerate is formed at theposterior margin of the trochantin. The praecoxa prevents contact of the anterior margin of the trochantin with LIM, and contact of the anterior margin of the praecoxa with LIM does not promote leg regeneration.

Characters for determining the sex of cutworms and other noctuid larvae (Lepidoptera: Noctuidae)

1973 ◽  
Vol 51 (12) ◽  
pp. 1235-1241 ◽  
Author(s):  
C. F. Hinks ◽  
J. R. Byers
Keyword(s):  
Abdominal Segment ◽  
Anterior Margin ◽  
Accurate Determination ◽  
Lepidoptera Noctuidae

External structures were found which permitted the accurate determination of males, or females, or both in the larvae of each of 40 species of noctuids.In males, the developing genitalia arise from a pyriform histoblast attached to the ventral cuticle near the anterior margin of the ninth abdominal segment. The cuticle is invaginated into this structure, which is visible externally as a slit, or as a depression, but it is often obscure. In some species the invaginated cuticle is strongly melanized, and consequently very distinct, but in most it is either colorless or too variable to be useful as the definitive sexual character.In females there is one pair of ovoid histoblasts attached to the ventral cuticle in each of the eighth and the ninth abdominal segments. Externally, the cuticle corresponding to these areas of attachment is modified; usually the cuticular sculpturing is reduced or absent, about, and sometimes beyond, these areas. Each area is usually recessed and forms a more or less distinct pit. These structures proved reliable for sexing larvae and in every species were located between the ventral and subventral setae in the eighth and ninth abdominal segments.

A new species of Paracrenhydrosoma (Copepoda: Harpacticoida: Cletodidae) from a subtidal muddy bottom of southern Korea, with a key to the species of Acrenhydrosoma-complex

2014 ◽  
Vol 94 (5) ◽  
pp. 981-991 ◽  
Author(s):  
Sung Joon Song ◽  
Hans-Uwe Dahms ◽  
Chang-Rae Lee ◽  
Jongseong Ryu ◽  
Jong Seong Khim
Keyword(s):  
New Species ◽  
Abdominal Segment ◽  
Anterior Margin ◽  
Caudal Ramus ◽  
Worldwide Distribution ◽  
Muddy Bottom ◽  
Southern Korea ◽  
A New Species

A new species of Paracrenhydrosoma (Copepoda: Harpacticoida: Cletodidae) is described from samples taken from muddy bottoms in Jangmok, Geoje Island, Korea. The genus Paracrenhydrosoma is distinguished from other genera of the Acrenhydrosoma-complex (Acrenhydrosoma, Dyacrenhydrosoma and Neoacrenhydrosoma) by carrying an antennal exopod with two setae, P1 endopod with three setae, P3 endopod with two setae and P5 exopod with two setae. The new species differs from its congeners as follows: bifid rostrum on anterior margin, long caudal ramus, exceedingly long baseoendopodal mucroniform process of female P5 that reaches the end of the second free abdominal segment, and modified P3 endopod of male. A tabular key to aid in the identification of the Acrenhydrosoma-complex is provided. The worldwide distribution of the Acrenhydrosoma-complex is summarized and discussed.

A new species of Chorisquilla Manning, 1969 (Stomatopoda: Protosquillidae) from Korea and Japan with redescription of C. mehtae Erdmann & Manning, 1998

Zootaxa ◽  
2018 ◽  
Vol 4483 (2) ◽  
pp. 365
Author(s):  
HEE-SEUNG HWANG ◽  
SHANE T. AHYONG ◽  
WON KIM
Keyword(s):  
New Species ◽  
Coastal Waters ◽  
Anterior Margin ◽  
Dorsal Surface ◽  
Developmental Changes ◽  
Lateral Margin ◽  
Abdominal Somite ◽  
Mantis Shrimp ◽  
A New Species ◽  
Lateral Plates

A new species of protosquillid mantis shrimp is described from the coastal waters of Korea and Japan. Chorisquilla orientalis n. sp. is distinguished from congeners by the combination of deep grooves and pits on the dorsal surface of abdominal somite 5, 8–14 spines on lateral margin of the telson, numerous minute dorsal spines on the telson and abdominal somite 6, and large, pyriform submedian bosses on the telson preceded by a small rounded boss. Chorisquilla orientalis is morphologically closest to C. mehtae Erdmann & Manning, 1998, from Indonesia, but differs chiefly in the dorsal ornamentation of abdominal somite 6 and the telson and reaches a considerably larger size. Chorisquilla orientalis n. sp. shows developmental changes from juvenile to adult in the shape of the ocular scales and anterior margin of lateral plates of carapace, and in the number of lateral spines on telson. Also, C. mehtae Erdmann & Manning, 1998, which, to date has not been adequately illustrated, is redescribed and figured. A key to the Korean gonodactyloids is presented. 

Larval morphology of the water mite Sperchonopsis reducta Sokolow, 1940 (Acariformes, Sperchontidae)

2010 ◽  
Vol 19 (1) ◽  
pp. 23-28
Author(s):  
P.V. Tuzovskij
Keyword(s):  
Anterior Margin ◽  
Dorsal Plate ◽  
Larval Morphology ◽  
Water Mite

A larva of the water mite Sperchonopsis reducta Sokolow, 1940 is described. The idiosoma of the larva bears 18 pairs of setae, the dorsal plate has a wide and slightly convex anterior margin and a pointed posterior end; the setae Fch are not longer than the trichobothria Fp and Oi, the setae Pe are shorter and thinner than the setae Pi; the urstigmae are with well developed caps; the capitulum has a long basis and a short rostrum; the pedipalpal tarsus bears three large serrate unequal setae, a single solenidion, and four thin short smooth setae.

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