Aspidosiphon (Paraspidosiphon) pastori, Silva-Morales & Gómez-Vásquez, 2021

Silva-Morales, Itzahí & Gómez-Vásquez, Julio D., 2021, First records and two new species of sipunculans (Sipuncula) from the Southern Mexican Pacific, European Journal of Taxonomy 740 (1), pp. 77-117 : 101-103

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.

Figures

Fig. 13. – A–F. Aspidosiphon (Paraspidosiphon) pastori sp. nov., holotype (UMAR-SIPU 128). A. External morphology. B. Internal morphology. C. Anal shield. D. Bidentate hook. E. Papillae from introvert. F. Pyramidal hook. – G. Bidentate hook of A. (P.) fischeri ten Broeke, 1925 from the Mexican Caribbean. Abbreviations: I = intestine; LM = longitudinal muscle; N = nephridium; RM = retractor muscles; S = streak.