scholarly journals A revision of the unusual feather star genus Atopocrinus with a description of a new species (Echinodermata: Crinoidea)

Zootaxa ◽  
2020 ◽  
Vol 4731 (4) ◽  
pp. 471-491
Author(s):  
CHARLES G. MESSING
Keyword(s):  
New Species ◽  
Deep Water ◽  
Distal Half ◽  
Genus Level ◽  
Live Specimen ◽  
Feather Star ◽  
A New Species ◽  
Feather Stars

Atopocrinus ojii new species, is described from deep water off Japan. The genus was previously monotypic and known only from the holotype of A. sibogae A. H. Clark, 1912, from Indonesia. Examination of all known specimens of Atopocrinus has added the following genus-level characters: cirrus sockets arising as tubes along the adoral surface of the centrodorsal, and faint, superficial, suture-like lines that cross the interradial ridges aboral to the centrodorsal/basal suture. The new species exhibits additional novel characters, some of which may be unique (e.g., deep pores around cirrus sockets) and others that may be shared with the incomplete holotype of A. sibogae (e.g., hollow pinnulars). Confusion about the structure of basal ossicles versus basal rays in Atopocrinus and other extant feather stars prompted inclusion of a review of the structure and development of these skeletal components. Video of a live specimen attributed to A. sibogae revealed that the distal half of the arms lack pinnules. The new species also shares several characters in common with Jurassic Spinimetra chesnieri Hess & Thuy, 2017. 

scholarly journals Discometra luberonensis sp. nov. (Crinoidea, Himerometridae), a new feather star from the Late Burdigalian

2020 ◽  
Vol 729 ◽  
pp. 121-137
Author(s):  
Marc Eléaume ◽  
Michel Roux ◽  
Michel Philippe
Keyword(s):  
New Species ◽  
Type Species ◽  
Northern Flank ◽  
Extant Species ◽  
Feather Star ◽  
A New Species ◽  
Feather Stars

Most fossil feather stars are known only from the centrodorsal often connected to the radial circlet. This is the case for Discometra rhodanica (Fontannes, 1877), the type species of the genus Discometra, collected from the Late Burdigalian of the Miocene Rhône-Provence basin (southeastern France). The quarries operating in this area have exposed layers from the Late Burdigalian on the northern flank of the Lubéron anticline near Ménerbes (basin of Apt, Vaucluse, southeastern France). These layers contain exceptionally well-preserved echinoderms, among which are three specimens of a feather star with cirri and arms still connected to the centrodorsal. They are attributed to a new species: Discometra luberonensis sp. nov. (Himerometridae). The number of arms can reach 60, as in extant species of the genus Himerometra, but the pattern of arm divisions is closer to that of the genus Heterometra, which has no more than 45 arms in extant species. Discometra luberonensis sp. nov. differs from D. rhodanica by the characters of its centrodorsal. Here we redescribe the centrodorsal and radial circlets of D. rhodanica based on previously and newly collected specimens. We designate a neotype for D. rhodanica, because the holotype is considered lost. Affinities between Discometra, Himerometra and Heterometra are discussed.

Bougainvillia aberrans (Cnidaria, Hydrozoa), a new species of hydroid and medusa from the upper bathyal zone off Bermuda

1993 ◽  
Vol 71 (5) ◽  
pp. 997-1002 ◽  
Author(s):  
Dale R. Calder
Keyword(s):  
New Species ◽  
Atlantic Ocean ◽  
North Atlantic ◽  
Deep Water ◽  
North Atlantic Ocean ◽  
Deep Water Species ◽  
A New Species ◽  
Water Species

Bougainvillia aberrans n.sp. is described from Bermuda in the western North Atlantic Ocean. Specimens were collected at a depth of 150 fathoms (274 m) from the polypropylene buoy line of a crab trap. The hydroid colony of B. aberrans is erect, with a polysiphonic hydrocaulus, a smooth to somewhat wrinkled perisarc, hydranths having a maximum of about 16 tentacles, and medusa buds arising only from hydranth pedicels. Medusae liberated in the laboratory from these hydroids differ from all other known species of the genus in having a long, spindle-shaped manubrium, lacking oral tentacles, having marginal tentacles reduced to mere stubs, and being very short-lived (surviving for a few hours at most). Gonads develop in medusa buds while they are still attached to the hydroids, and gametes are shed either prior to liberation of the medusae or shortly thereafter. The eggs are surrounded by an envelope bearing nematocysts (heterotrichous microbasic euryteles). The cnidome of both hydroid and medusa stages consists of desmonemes and heterotrichous microbasic euryteles. The diagnosis of the genus Bougainvillia is modified to accommodate this new deep-water species.

scholarly journals A new species of Neotanais Beddard (Crustacea: Tanaidacea) from the Subantartctic, off the Falkland Islands

Zootaxa ◽  
2003 ◽  
Vol 339 (1) ◽  
pp. 1 ◽  
Author(s):  
KIM LARSEN ◽  
MAGDALENA BLAZEWICZ-PASZKWYCZ
Keyword(s):  
New Species ◽  
Deep Water ◽  
Falkland Islands ◽  
Dorsal Margin ◽  
Male And Female ◽  
Recent Activity ◽  
A New Species

The male and female of Neotanais krappschickelae n.sp., from the Subantarctic off the Falkland Islands are described from the RV Eltanin deep-water cruises of 1962. Both male and female of the new species can be separated from other species by the combination of characters including: a densely setose dorsal margin of the cheliped carpus, dactylus and fixed finger of subequal length; cheliped sclerite, all pereopodal bases, and posterior-lateral edges of pereonites with numerous plumose setae. The recent activity within tanaidacean taxonomy including neotanaid taxonomy has made it necessary to re-diagnose Neotanais.

А new species of Alona Baird, 1843 (Cladocera: Chydoridae) from the ancient Lake Ohrid

Zootaxa ◽  
2018 ◽  
Vol 4526 (4) ◽  
pp. 434
Author(s):  
ARTEM Y. SINEV ◽  
CHARO LÓPEZ-BLANCO
Keyword(s):  
New Species ◽  
Ancient Lakes ◽  
Ancient Lake ◽  
Lake Ohrid ◽  
Genus Level ◽  
Palearctic Species ◽  
Level Group ◽  
A New Species

A new species of Cladocera, Alona begoniae sp. nov. (Anomopoda: Chydoridae) was found in ancient Lake Ohrid. Its habitus and outer morphology is similar to one of the most common Palearctic species, Coronatella rectangula (Sars, 1862), and this can be the main reason why it has remained undiscovered. A. begoniae sp. nov. belongs to the elegans-group of Alona s. lato, a relict genus-level group not formally recognised yet as a separate taxonomical unit. Its habitat seem to be sandy and stony substrates (at 2–12 m depth) bare of vegetation. The position of this new species within the Alona-like anomopods is evaluated and similarities with other cladocerans in ancient lakes are discussed. 

A new species of the genus Rapturella (Gastropoda: Acteonidae) from southeast Brazil

Zootaxa ◽  
2018 ◽  
Vol 4521 (1) ◽  
pp. 125 ◽  
Author(s):  
CARLO M. CUNHA ◽  
LUIZ RICARDO L. SIMONE
Keyword(s):  
New Species ◽  
Continental Shelf ◽  
Deep Water ◽  
Shell Morphology ◽  
Southwest Pacific ◽  
Southeast Brazil ◽  
Pacific Waters ◽  
A New Species ◽  
High Diversity

Acteonidae d'Orbigny, 1843 is the largest family within the superfamily Acteonoidea (Bouchet et al. 2017) and includes small gastropods typical of infralittoral environments. Most acteonids living on the continental shelf or in deep water have been described on the basis of shell morphology alone (Simone 2006; Valdés 2008; Cunha 2011; Salvador & Cunha 2016), because little material with soft parts has been collected and examined. Consequently, little is known about the ecology of the species.  Recently, many new species of the genus Acteon Montfort, 1810 have been described from tropical Southwest Pacific waters (Valdés 2008), suggesting that a high diversity of acteonid species may await discovery in other deep water environments, including those of Brazil. 

Alpheus luiszapatai, a new species of rare and colorful deep water alpheid shrimp (Crustacea: Decapoda: Alpheidae) from Arusí, Chocó Department, Pacific Coast of Colombia

Zootaxa ◽  
2018 ◽  
Vol 4403 (3) ◽  
pp. 540 ◽  
Author(s):  
GABRIEL E. RAMOS-TAFUR
Keyword(s):  
New Species ◽  
Deep Water ◽  
Pacific Coast ◽  
Morphological Characters ◽  
Species Group ◽  
Eastern Pacific ◽  
Single Female ◽  
Western Atlantic ◽  
A New Species ◽  
Alpheid Shrimp

A new species of deep water alpheid shrimp, Alpheus luiszapatai sp. nov., from Arusí, Chocó, Pacific coast of Colombia is described. The single female known was collected between the discarded bycatch of deep water shrimp trawls dedicated to the commercial fisheries of the “coliflor” shrimp Solenocera spp. This new species is placed putatively in the Alpheus brevirostris (Olivier, 1811) species group, and share some external morphological characters with Alpheus hephaestus Bracken-Grissom & Felder, 2014. It can be differentiated by the shape and ornamentation of major and minor chelipeds, the propodi and dactyli of third to fifth pereopods, the diaresis of uropodal exopod, the length of the rostral carina, color in life and bathymetric distribution. Additional comparison with another congeners pertaining to this species group complex from the eastern Pacific, western Atlantic and other oceanographic regions is discussed. A key for Alpheus brevirostris species group from the eastern Pacific is presented. 

A new species of Platepistoma Rathbun, 1906 (Decapoda: Brachyura: Cancridae) from deep water off South Africa

Zootaxa ◽  
2012 ◽  
Vol 3522 (1) ◽  
pp. 73
Author(s):  
PETER J. F. DAVIE ◽  
PETER K. L. NG
Keyword(s):  
South Africa ◽  
New Species ◽  
Deep Water ◽  
Dorsal View ◽  
Kwazulu Natal ◽  
A New Species

Platepistoma seani sp. nov. is described from deep water off KwaZulu-Natal Province, South Africa. It can be separatedfrom its nearest relative, Platepistoma guezei (Crosnier, 1976), by its thicker setal covering that completely hides the an-terolateral teeth from dorsal view, less well defined carapace regions, more spinous anterolateral and posterolateral cara-pace margins, sparser but more prominent dorsal carapace spines, more prominent spines on the carpus of the cheliped, and a relatively narrower male telson.

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