Paraehlersia pamelae Prado & Martín 2024, n. sp.
Creators: name: Prado, Ainhoa
name: Martín, Guillermo San
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Polychaeta
Phyllodocida
Syllidae
Paraehlersia
Paraehlersia pamelae

description: Paraehlersia pamelae, n. sp.
Figs 2–5
Material examined. Alborán Sea; Holotype (MNCNM 16.01.19285), 35º50’41”N, 03º13’39”W, gravel with organic detritus, 111–114 m, 25 September 2011; 44 Paratypes (MNCNM 16.01.19286) (7 mounted for SEM), 35º50’41”N, 03º13’39”W, gravel with organic detritus, 111–114 m, 25 September 2011; 6 Paratypes (MNCNM 16.01.19287) 36º00’40”N, 02º55’32”W, gravel with organic detritus, 93–101 m, 24 September 2011; 1 Paratype (MNCNM 16.01.19288), 35º53’10”N, 03º04’74”W, rhodoliths, 82–92 m, 23 September 2011; 1 Paratype (MNCNM 16.01.19289). 35º50’40”N, 03º13’72”W, 100–109 m, 25 September 2011.
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......Continued on the next pageSAMPLES Subfamily Species BV13 BV14 BV16 BV17 BV21 BV27 BV35 DR01 DR02 DR07 DR20 DR22 DR25 DR37 DR39 DR40DR47S. columbretensis(Campoy, 1982) 2S. corallicolaVerrill, 1900 1 1S. cruziNúñez & San Martín, 1991 6 2S. crypticaBen-Eliahu, 1977 1 2S. garciai(Campoy, 1982) 7 3 5S. hyalinaGrube, 1863S. parapariSan 38 2 4 23 Martín & López, 1 2000S. profundaCognetti, 1955 3 7 1S. pulvinata(Langerhans, 1881) 2S.sp. 2 2S. variegataGrube, 1860 3Trypanosyllis krohniiClaparède, 1864 1 2Trypanosyllissp. 1T. zebra(Grube, 1860) 2Xenosyllis scabra(Ehlers, 1864) 4
......Continued on the next pageSAMPLES Subfamily Species BV13 BV14 BV16 BV17 BV21 BV27 BV35 DR01 DR02 DR07 DR20 DR22 DR25 DR37 DR39 DR40DR47Autolytinae Langerhans, 1879Epigamia labordai(San Martín & López 2002) 1Myrianida. prolifera(O. F. Müller 1788) 2Myrianidasp. 1 2
Description. Body slender, elongate, holotype 3.52 mm long, 0.3 mm wide, 60 chaetigers, lacking color; longest paratype 6 mm long, 67 chaetigers; some specimens with posterior part coiled (Fig. 3A; preserved specimens) with minute pores on dorsal side (Fig. 4A). Prostomium oval to semicircular, with four small eyes in open trapezoidal arrangement and two minute, anterior ocular spots (Fig. 2A). Median antennae inserted almost on middle of prostomium, between posterior eyes, somewhat longer than prostomium and palps together, slightly pseudo-articulated distally; lateral antennae about half long as median one, inserted in front of anterior eyes, smooth or slightly pseudo-articulated depending on specimen (Figs 2A, 3A–B). Palps large, triangular, longer than prostomium, fused at bases with a distinct groove (Figs 2A, 3B, 4D) and two ventro-lateral rows of small ciliary tufts (Fig. 4D). Peristomium shorter than subsequent segments; dorsal tentacular cirri similar in length to lateral antennae, ventral tentacular cirri slightly shorter (Figs 2A, 3B). Anterior segments each with a single dorsal, transversal ciliary band (Fig. 3B, C), double in midbody segments (Fig. 3D), then single again on posterior segments (Fig. 3E). Dorsal cirri slender, elongated, alternating long and short all along body, smooth (Figs 2A, 3F), or slightly pseudo-articulated distally on most anterior ones (Figs 2A, 3A, B). Subcirral papillae below anterior dorsal cirri, small, rounded (Figs 3F, 4A, B). Ventral cirri short, digitiform (Figs 3D, E, 4C, D). Anterior parapodia (Figs 3B, 4C, D) each with 3–5 compound chaetae with long, filiform, spiniger-like blades, 81 μm long, distally indistinctly bifid, with short spines on margin (Figs 2B, 4C, 5A); and 7–9 falcigers with elongated, bidentate blades (Figs 2C, 5C), most dorsal 42 μm long, most ventral 20 μm, with both teeth of similar size, with short spines on margin (Figs 2C, 4C, 5C). Number of spiniger-like and falcigers per parapodium decreasing posteriorly. Midbody parapodia with 1–2 (3), spiniger-like chaetae, similar to anteriormost parapodia, but with 95 μm long blades (Fig. 2D), apparently unidentated under light microscope, slightly bidentate under SEM (Fig. 5B), and 4–6 falcigers, about 17 μm long, with both teeth similar in size (Figs 2E, 5D). Posterior parapodia with chaetae similar to those at midbody, 1–2 spiniger-like chaetae 100 μm long (Fig. 2F), and 4–5 falcigers 16 μm long, with both teeth similar or proximal slightly longer than distal, slightly curved (Figs 2G, 5E, F). Dorsal simple chaetae on posterior segments (also in anterior or midbody segments in some specimens), slightly curved, distally blunt and slightly bidentate, both teeth broad (Figs 2H, 5G–H); ventral simple chaetae only on posterior segments, markedly bidentate, both teeth acute, proximal slightly longer than distal one, apparently smooth under light microscope (Fig. 2I), finely serrated under SEM (Fig. 5I). Anterior parapodia each with three slender aciculae (Fig. 2J); with decreasing posteriorly to only one distally oblique at late midbody and posterior parapodia (Fig. 2K, L). Pharynx long and slender, longer than proventricle, through about 10 segments, with a small pharyngeal tooth located on anterior margin, surrounded by a crown of ten soft, ciliated papillae (Figs 4D–F); pharynx inside a sheath with distal small papillae (Fig. 5D). Proventricle rectangular, through about five segments, with about 18 muscle cell rows (Fig. 2A). Pygidum small, triangular, with two long, smooth anal cirri.
description: Published as part of Prado, Ainhoa & Martín, Guillermo San, 2024, Syllidae (Annelida) from the Alborán Sea (Western Mediterranean), with the description of a new species of Paraehlersia San Martín, 2003, pp. 87-104 in Zootaxa 5437 (1) on pages 90-96, DOI: 10.11646/zootaxa.5437.1.5, http://zenodo.org/record/10959306