Caulleriella suroestense, Blake, 2018

Blake, James A., 2018, Bitentaculate Cirratulidae (Annelida, Polychaeta) collected chiefly during cruises of the R / V Anton Bruun, USNS Eltanin, USCG Glacier, R / V Hero, RVIB Nathaniel B. Palmer, and R / V Polarstern from the Southern Ocean, Antarctica, and off Western South America, Zootaxa 4537 (1), pp. 1-130 : 54-56

publication ID

https://doi.org/ 10.11646/zootaxa.4537.1.1

publication LSID

lsid:zoobank.org:pub:169CBE5C-3A6E-438B-8A81-0491CBFBAC85

DOI

https://doi.org/10.5281/zenodo.3798564

persistent identifier

https://treatment.plazi.org/id/03A2CB16-FFC0-A27D-FF36-FADEFB84FDA4

treatment provided by

Plazi

scientific name

Caulleriella suroestense
status

sp. nov.

Caulleriella suroestense View in CoL new species

Figure 27 View FIGURE 27

Material examined. Off Chile, Juan Fernandez Islands, Robinson Crusoe Island, the embayment behind Punta Suroeste , SEPBOP, R / V Anton Bruun, Cr. 12, Sta. DRAB 134 , 13 Dec 1965, 33.623°S, 78.906°W GoogleMaps , diving, holotype ( USNM 1490725 About USNM ) and 3 paratypes ( USNM 1490726 About USNM ) .

Description. Small species with thick, tumid body and numerous crowded segments. All four type-specimens complete with curved or coiled bodies. Holotype 6.1 mm long, 0.45 mm wide across anterior segments, 0.65 mm wide across middle and posterior segments, with about 85 setigerous segments; paratypes similar, but smaller. Body with dorsum rounded, elevated over lateral parapodia throughout ( Fig. 27 View FIGURE 27 A–B), venter with broad groove along most of body ( Fig. 27C View FIGURE 27 ). Color in alcohol tan, heavily pigmented with numerous black subdermal cells; pigment scattered in patches over most of body, concentrated in parapodia of middle and posterior segments.

Prostomium triangular, tapering to narrow tip ( Fig. 27 View FIGURE 27 A–B); eyespots absent; nuchal organs small oval openings on posterior of prostomium, lateral and dorsal to mouth opening ( Fig. 27A View FIGURE 27 ). Peristomium thick, with one short anterior ring and one large posterior ring incised with indistinct folds and grooves ( Fig. 27 View FIGURE 27 A–B); broad dorsal crest present. Dorsal tentacles close to one another on posterior margin of peristomium ( Fig. 27B View FIGURE 27 ). First branchiae on setiger 1 dorsal to notosetae ( Fig. 27 View FIGURE 27 A–B); following segments with branchiae in similar position; branchiae long, narrow anteriorly; short, thick posteriorly, continuing to near end of body.

Parapodia with noto- and neuropodia widely separated from one another throughout, forming prominent shoulders both dorsally and ventrally ( Fig. 27A, C View FIGURE 27 ). Notosetae include about 12 long capillaries on first 15 setigers, then reduced to 8–10 capillaries with first hooks appearing by setigers 27–28; hooks 1–2 at first with 3–4 thin capillaries, increasing to 4–5 hooks and 2–3 thin capillaries, continuing to near posterior end. Neurosetae with hooks from setiger 1, numbering four per neuropodium at first, increasing to five hooks along most of body; no capillaries in neuropodia throughout. Hooks short, thick, weakly sigmoid in shape with thick main fang surmounted by short, closely applied secondary tooth ( Fig. 27D View FIGURE 27 ); hooks without hood or sheath.

Posterior end terminating in pygidial segment with anal opening surrounded by about eight short papillae and ventral lobe ( Fig. 27C View FIGURE 27 ).

Methyl Green stain. Stain not retained.

Etymology. This species is named for the collection site near Punta Suroestense, Juan Fernandez Islands.

Remarks. The short curved body with thick, crowded segments and the distinctive overall pigmentation caused by numerous black pigmented cells readily distinguishes Caulleriella suroestense n. sp. from other congeners. The five species of Caulleriella described by Dean & Blake (2007) from intertidal and shallow sediments off Costa Rica, C. ecuadoriana n. sp. described in the present study from shallow water off Ecuador, and C. suroestense n. sp. are the only species having two peristomial rings instead of three and up to eight papillae on the pygidium dorsal to the anus plus a ventral lobe. However, C. suroestense n. sp., C. dulcei Dean & Blake, 2007 , and C. murilloi Dean & Blake, 2007 each have neuropodial hooks from setiger 1 and lack capillaries in posterior neuropodia; C. murilloi has a hood covering the teeth of the bidentate hooks that is lacking in both C. suroestense n. sp. and C. dulcei . Although morphological differences are present between these shallow water species from Central and South America, great care must be taken to ensure that all relevant morphology is observed when identifying Caulleriella species from these locations.

Distribution. Off Chile, Juan Fernandez Islands, shallow subtidal depths.

R

Departamento de Geologia, Universidad de Chile

V

Royal British Columbia Museum - Herbarium

GBIF Dataset (for parent article) Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF