Tetreres israeli Chávez-López 2022, sp. nov.
Creators: name: Chávez-López, Yessica
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Polychaeta
Sabellida
Sabellariidae
Tetreres
Tetreres israeli

description: Tetreres israeli sp. nov.
urn:lsid:zoobank.org:act: C1846882-4FD6-4BBF-AAD3-52C523251A89
Figs 18–19
Diagnosis
Outer paleae lanceolate, compressed with sharp tips, elongated and slender. Inner paleae cylindrical, smooth, with blunt tip. Two to four tentacular filaments per lobe.
Etymology
This species is named in memory of my grandfather Israel López, an exemplary man. The species name is a noun in the genitive case (ICZN 1999, Art. 31.1.2).
Material examined
Holotype CARIBBEAN SEA • complete spec. (very damaged); Virgin Islands; RV Pillsbury, stn 1401; 18°51′ N, 65°04′ W; depth 4180 m; 12 Jul. 1972; UMML-22.1195.
Paratype CARIBBEAN SEA • 1 spec.; same collection data as for holotype; UMML-22.1196.
Description
BODY. Holotype complete (UMML-22.1195), very damaged, 40 mm long, 0.5 mm wide, four parathoracic segments, five abdominal segments (Fig. 18A–D).
OPERCULUM. Opercular disc oblique. Opercular crown with almost all opercular paleae broken (Fig. 18B– C). Outer paleae arranged in semicircles, seven paleae on left lobe, 18 on right (Fig. 18B–F). Inner paleae in short ventral line on each inner margin of opercular lobes, three paleae on left lobe, four on right (Fig. 18B, F). Outer paleae amber, lanceolate, compressed, 3 mm long. Blade six times as long as wide (Fig. 19A–B). Tip sharp, elongate, slender (Fig. 19B). Inner paleae amber, cylindrical, smooth, tip blunt (Fig. 19C–D). Opercular stalk orange to pale yellow, almost three times as long as wide (Fig. 18B). Opercular papillae not observed. One pair of nuchal hooks amber, long, robust, with short limbation, tip strongly curved (Figs 18B, 19E). In lateral view, nuchal hooks distally curved at angle of ~115° (Fig. 19F). Palps and median organ not observed. Tentacular filaments damaged, simple, slender; two tentacles on left lobe, four on right (Fig. 18C).
THORAX. First thoracic segment without cirrus or chaetae. Second segment with two triangular-shaped lateral lobes and paired branchiae.
PARATHORAX. With four segments, branchiae not seen. Notopodia with lanceolate and capillary chaetae. Neurochaetae capillary.
ABDOMEN. Abdominal segments yellowish, not very well defined. Neuropodia small, with capillary chaetae, ornamented with irregular thecal laminar extensions (Fig. 19G–H). Notopodia robust, uncini not seen.
Variation
Specimen incomplete 28 mm long, 4 mm wide, 3 abdominal segments (Fig. 18E–F).
Remarks
In the Caribbean Sea and the Gulf of Mexico, Tetreres varians (Treadwell, 1901) was the only species of the genus recorded. Tetreres israeli sp. nov. and T. varians differ mainly in the morphology of the outer blades, being lanceolate in T. israeli sp. nov. (Fig. 19A–B) and oblong in T. varians (Augener 1906: pl. 7, fig. 131; Kirtley 1994: fig. 12.10.3a, d–f).
The morphology of the paleae of T. israeli sp. nov. resembles those of T. perryi Kirtley, 1994 (Northwest Atlantic). Both species have lanceolate outer paleae with elongate tips; however, T. perryi has outer paleae with transverse irregular thecae, whereas T. israeli sp. nov. has no transverse thecae.
Distribution
Only known from the type locality, Virgin Islands, at 4180 m depth (Fig. 22).
description: Published as part of Chávez-López, Yessica, 2022, New species of sabellariids (Annelida: Sabellariidae) from the Caribbean Sea and the Gulf of Mexico, pp. 109-148 in European Journal of Taxonomy 831 on pages 139-142, DOI: 10.5852/ejt.2022.831.1873, http://zenodo.org/record/6885276