Scionides reticulata ( Ehlers, 1887 )

Londoño-Mesa, Mario H., 2009, Terebellidae (Polychaeta: Terebellida) from the Grand Caribbean region 2320, Zootaxa 2320 (1), pp. 1-93 : 60

Scionides reticulata ( Ehlers, 1887)

Figures 18 A-C

Terebella reticulata Ehlers, 1887:245–248 , Pl. 52, Figs 5–7 , 14a,b (not 8a,b).— Hessle, 1917:184.— Hartman, 1938:18. Scionides reticulata .— Hartman, 1959:521.

Type material: Holotype MCZ 840 (1) Key West , Florida, USA, "Blake Exp. 1877–78"; 1.8–3.6m.

Description: Type specimen complete, in poor condition, dried out, broken in three pieces. Anterior fragment with 17 segments ( Fig. 18A ), middle one damaged, with 15 segments ( Fig. 18B ), posterior one with 16 segments ( Fig. 18C ). Body dark brown. Tentacular membrane with thick edge, short base; without tentacles attached. Upper lip short, projecting forward, undulating dorsally. Lower lip depressed (because of dehydratation). Fourteen ventral shields, slightly decreasing in size; ventral groove dividing shields in pairs in middle region and in abdomen. Nephridial papillae not seen. Branched branchiae incomplete and in poor condition. Notopodia conical, almost all notochaetae broken, few of them present, distally serrated, and twisted. Anterior thoracic uncini MF:2–3:2–3:2:1–2, PP triangular; PF absent; Oc slightly convex; Cp short with four rows of teeth; MF as long as twice the teeth in the first row; USr concave, rounded, almost closed, SrP and and SrA absent; LSr convex; AP triangular; AF absent. Posterior thoracic and abdominal uncini resembling those from anterior thoracic segments; abdominal ones smaller. Pygidium smooth, slightly damaged.

Discussion: Since the original description, there have been no additional records of this species from the Caribbean . Hartman (1938) studied the type and added that notochaetae are distally serrated, which Banse (1980) confirmed. Thus, this genus is monotypic and valid. Banse (1980) wrongly suggested S. dux as a junior synonym of S. reticulata ; rather it is a junior synonym of Neoamphitrite robusta (Johnson, 1901) as stated by Banse (1980).

Finally, figures presented by Ehlers (1887) of uncini belong to P. cetrata , as it is indicated in the discussion of that species, and those from P. cetrata belong to S. reticulata .

Type locality and distribution: Key West , Florida, USA .

Figures

FIGURE 5. Lysilla caribe sp. nov., (UMML 22.1000 2Cc): A. Ventral view. B. Fascicle of notochaetae from segment 4. C. Parapodia from segment 8. Polycirrus angeli sp. nov., (Holotype UANL 6490): D. Thoracic region in dorsal view. E. Thoracic region in ventral view. F. Fascicle of notochaetae from segment 8. G. Uncini from segment 8. Scale bars: A,D,E: 1mm; B,C,F: 0.5mm; G: 0.02mm.

FIGURE 6. Polycirrus purpureus. Type specimens of P. luminosus (Hypotype YPM 1311): A. General view. B. Thoracic region in lateral view. C-D. Thoracic region in ventral view. E. Fascicle of notochaetae from anterior thoracic region. F. Notochaeta from anterior thoracic region. G-H. Uncini from anterior thoracic region. Scale bars: A: 1.85mm; B,C,D: 1mm; E: 0.5mm; F: 0.05mm; G: 0.02mm.

FIGURE 7. Eupolymnia crassicornis: A. Anterior end. B. Chaeta. C. Uncinus (improved from Schmarda, 1861). Eupolymnia magnifica (Syntype USNM 4799): D. Anterior thoracic region in lateral view. E. Anterior end in lateral view. F. First seven parapodia in lateral view. G. Branchiae: longer (right) from segment 2, shorter (left) from segment 4. H. Bilimbate notochaetae from segment 10. I. Uncinus from segment 5. J. Uncinus from segment 11. K. Uncinus from segment 25. Eupolymnia nebulosa (NHM 1910.2.1): L. Bilimbate notochaeta from segment 11. M. Uncinus from segment 5. N. Uncinus from segment 11. O. Uncinus from segment 25. Scale bars: A,B,C: No original scale; D: 6mm; E,F: 3.6mm; G: 6mm; H,L: 0.9mm; I-K,M-O: 0.08mm.

FIGURE 14. Pista palmata (Syntype YPM 2746): A. Anterior thoracic region in ventral view. B. Anterior end in ventral view. C. Anterior end in dorsal view. D. Staining pattern of anterior thoracic region in lateral view. E. Staining pattern of anterior end in ventral view. F. Staining pattern after one day of anterior thoracic region in lateral view. G. Bilimbate notochaetae from segment 11. H. Uncinus from segment 5. I. Uncinus from segment 6. J. Uncinus from segment 7. K. Uncinus from segment 8. L. Uncinus from segment 25. Scale bars: A,D,E,F: 2.3mm; B,C: 2mm; G: 0.06mm; H-L: 0.04mm.

FIGURE 18. Scionides reticulata (Holotype MCZ 840): A. Thoracic region in ventral view. B. Middle region in ventral view. C. Posterior end in lateral view. Terebella turgidula (Holotype MCZ 846): D. Complete specimen. E. Anterior thoracic region in ventral view. F. Fascicle of notochaetae from anterior thoracic region. G. Long notochaeta from anterior thoracic region. H. Short notochaeta from anterior thoracic region. I. Uncinus from anterior thoracic region. J. Uncini in double rows from mid-thoracic region. Scale bars: A,B,C: 2.8mm; D: 23mm; E: 1.5mm; F: 0.4mm; G,H: 0.07mm; I,J: 0.05mm.