Aspidosiphon (Paraspidosiphon) pastori Silva-Morales & Gómez-Vásquez 2021, sp. nov.
Creators: name: Silva-Morales, Itzahí
name: Gómez-Vásquez, Julio D.
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Sipuncula
Phascolosomatidea
Aspidosiphoniformes
Aspidosiphonidae
Aspidosiphon
Aspidosiphon pastori

description: Aspidosiphon (Paraspidosiphon) pastori sp. nov.
urn:lsid:zoobank.org:act: F0F14077-9BB9-439E-AE38-A9EE4BEA0CBA
Fig. 13A–F
Etymology
This new species was named as “ pastori ” after Mr Pastor Silva Cruz, for his invaluable support and inspiration to work in the field of marine science.
Material examined
Holotype MEXICO • Oaxaca, Panteón Beach; 15°39′50.8″ N, 96°29′42.4″ W; 28 Apr. 2012; NHH and KLT leg.; in rocks; UMAR-SIPU 128.
Paratypes MEXICO – Oaxaca • 1; same collection data as for holotype; UMAR-SIPU 099 • 2; Panteón Beach; 15°39′50″ N, 96°29′42″ W; 30 Mar. 2017; JGV leg.; depth 2 m, in dead coral; UMAR-SIPU 100.
Other material
MEXICO – Guerrero • 7; Ixtapa Island, Coral Beach; 19 Sep. 2007; SGM leg.; in dead coral; UMAR- SIPU 084 • 1; Acapulco, Roqueta Island; 21 Sep. 2007; SGM leg.; in sponge; UMAR-SIPU 085 • 1; Barra de Potosí; 3 Dec. 2010; UMAR-SIPU 086. – Oaxaca • 1; La Entrega Beach; Aug. 2004; SGM leg.; in Spondylus limbatus G.B. Sowerby II, 1847; UMAR-SIPU 087 • 1; Estacahuite Beach; 18 Apr. 2005; SGM leg.; in dead coral; UMAR-SIPU 088 • 3; Estacahuite Beach; 30 Apr. 2005; in dead coral; UMAR-SIPU 089 • 13; Estacahuite Beach; 10 Sep. 2005; SGM leg.; in dead coral; UMAR-SIPU 090 • 1; Estacahuite Beach; 15 Aug. 2006; depth 4 m, in dead coral; UMAR-SIPU 091 • La Tijera Beach; 12 Sep. 2006; depth 4 m, in dead coral, UMAR-SIPU 092 • 2; Chacahua; 14 Apr. 2007; SGM leg.; in artificial monticule; UMAR-SIPU 094 • 1; Chacahua; 3 Apr. 2008; in rocks; UMAR-SIPU 095 • 2; Panteón Beach; 21 May 2008; MLY leg.; depth 3 m, in rocks; UMAR-SIPU 096 • 1; La Tijera Beach; 6 May 2009; in rocks; UMAR-SIPU 097 • 2; Salchi Beach; 26 March 2010; depth 7 m; UMAR-SIPU 098.
Description
Trunk 10 mm in length, smooth and thin (Fig. 13A). Anal and caudal shields yellow, introvert light brown and trunk white (Fig. 13C). Introvert two times as long as trunk. Rings of compressed, bidentate hooks, some hooks unidentate (Fig. 13D), followed by scattered and pyramidal hooks (Fig. 13F). Papillae present on entire introvert (Fig. 13E). Bidentate hooks with the streak oblique. Fifteen illdefined anastomosed muscle bands. Two retractor muscles fused at 75% of trunk length and occupying 90% of trunk. Nephridia occupying 30% of trunk length, open posteriorly to anus (Fig. 13B).
Remarks
The species that is most similar to Aspidosiphon (Paraspidosiphon) pastori sp. nov. is A. (P.) fischeri (ten Broeke, 1925) from Caracas Bay, Venezuela; however, they are different in the shape of the hooks and the longitudinal muscle bands. Aspidosiphon (Paraspidosiphon) pastori sp. nov. has hooks with an oblique streak, while A. fischeri has hooks with a straight streak (Fig. 13G). Aspidosiphon (Paraspidosiphon) pastori sp. nov. has 14–16 longitudinal muscle bands, while A. fischeri has 18–19 LMB.
Habitat
Intertidal to subtidal (7 m); in dead coral, sponges, bivalves and rocks.
Distribution
South Mexican Pacific, from Ixtapa Island, Guerrero, to La Entrega Beach, Oaxaca.
description: Published as part of Silva-Morales, Itzahí & Gómez-Vásquez, Julio D., 2021, First records and two new species of sipunculans (Sipuncula) from the Southern Mexican Pacific, pp. 77-117 in European Journal of Taxonomy 740 (1) on pages 101-103, DOI: 10.5852/ejt.2021.740.1283, http://zenodo.org/record/4643194