Revision of the genus Acryptolaria Norman, 1875 (Cnidaria, Hydrozoa, Lafoeidae) Author Peña Cantero, Alvaro L. Author Marques, Antonio C. Author Migotto, Alvaro E. text Journal of Natural History 2007 2007-03-26 41 5 - 8 229 291 http://dx.doi.org/10.1080/00222930701228132 journal article 10.1080/00222930701228132 1464-5262 4582056 Acryptolaria tortugasensis Leloup, 1935 ( Figures 14 , 16F , 18F , 19G ; Table XIV) Acryptolaria tortugasensis Leloup 1935 , p 13 , Figures 3 , 4 ; Bouillon et al. 1995 , p 51. Material examined Holoype: IRSNB , IG 10497 , 10 June 1925 , Tortugas, Florida , USA , one colony (alcohol) and two microslide preparations . Description One colony composed of a distally truncated, erect stem ca 60 mm in height, completely polysiphonic except for distal ends of branches. Main stem giving rise to lateral branches in approximately one plane, usually in an opposite or sub-opposite pattern, but with irregularities. Branches directed upwards with an angle of ca 60 ° or larger. Lateral branches polysiphonic, up to third-order, usually alternate or sub-opposite in one plane. Hydrothecae alternately arranged in two planes, forming a wide angle, sometimes close to 90 ° . Hydrotheca cylindrical, straight at adnate part, strongly curved outwards when it becomes free. Free part of adcauline hydrothecal wall convex. Abcauline wall straight basally, becoming concave at distal third with a marked inflexion point associated to a conspicuous internal cusp. Hydrothecal aperture circular, almost parallel to long axis of branch. Rim even, though slightly everted, with one or two short renovations. Coppinia not observed. Remarks Although this species has been considered conspecific with A. conferta by several authors (e.g. Fraser 1944 ; Vervoort 1968 ; Calder 1991 ), it can be distinguished from all other species. Acryptolaria tortugasensis is unique in the internal cusp present in the abcauline hydrothecal wall. It is also characterized by the obtuse angle, close to 90 ° , formed by the Table XIV. Morphometric data of the type material of Acryptolaria tortugasensis (in Mm).

Mean¡SD	Range	n
Hydrothecae
Length of abcauline wall	708.0¡11.0	700–720	5
Length of free adcauline wall	262.2¡55.4	200–380	9
Length of adnate adcauline wall	652.0¡53.6	590–700	5
Length of adcauline wall	905.0¡30.4	865–950	5
Ratio adnate/free adcauline wall	2–3.5
Diameter at aperture	157.8¡6.7	150–170	9
Diameter at base	78.8¡2.5	75–80	4
Nematocysts
Larger group	29.3¡0.8X9.9¡0.4	28–30X9–10.5	9
Smaller group	5.5¡0.5X2.8¡0.3	5–6X2.5–3	5

Figure 14. Acryptolaria tortugasensis Leloup, 1935 . (A–F) Branch fragments showing shape and arrangement of hydrothecae. All drawings from the holotype. Scale bar: 1 mm (A); 400 Mm (B–F). Figure 15. Hydrothecal arrangement in Acryptolaria . (A) A. abies ; (B) A. conferta ; (C) A. corniformis ; (D) A. crassicaulis ; (E) A. flabellum ; (F) A. gracilis . Scale bar: 500 Mm (A, B, D, E); 250 Mm (C); 100 Mm (F). Figure 16. Hydrothecal arrangement in Acryptolaria (continued). (A) A. longitheca ; (B) A. minima ; (C) A. minuta ; (D) A. operculata ; (E) A. pulchella ; (F) A. tortugasensis . Scale bar: 500 Mm (A, D); 250 Mm (B, C, E, F). Figure 17. Shape of hydrotheca in Acryptolaria . (A) A. abies ; (B) A. angulata ; (C) A. conferta ; (D) A. corniformis ; (E) A. crassicaulis ; (F) A. flabellum . Scale bar: 250 Mm. Figure 18. Shape of hydrotheca in Acryptolaria (continued). (A) A. gracilis ; (B) A. longitheca ; (C) A. minima ; (D) A. operculata ; (E) A. pulchella ; (F) A. tortugasensis . Scale bar: 100 Mm (A, C, F); 250 Mm (B, D, E). Figure 19. Shape of gonothecae: (A) Acryptolaria conferta ; (B) A. minima . Detail of different structures: (C) bottleneck-shaped basal part of hydrotheca in A. gracilis ; (D) opercular structure in A. minima ; (E) opercular structure in A. operculata ; (F) longitudinal striae in hydrotheca of A. flabellum ; (G) intrathecal cusp of A. tortugasensis . Scale bar: 100 Mm (A, B, D, F, G); 50 Mm (C); 250 Mm (E). Table XV. Comparative morphometric data of the species of Acryptolaria (in Mm).

A.	A.	A.	A.	A.	A.	A.	A.	A.	A.	A.	A.	A.
abies	angulata	conferta	bulbosa	corniformis	crassicaulis	flabellum	gracilis	longitheca	minima	minuta	operculata	pulchella			600–800	784–952	700–944	680–760	1600–1900	1144–1440	700–960	760–920	940–1144	392–480	465–650	1800–2100	650–800	623–769	700–720	220–380	291–425	280–440	280–440	680–930	416–696	230–504	176–320	420–680	48–136	146–308	910–1070	150–260	440–495	200–380	500–680	392–719	560–760	400–520	920–1300	976–1120	490–880	720–864	712–784	384–496	353–463	1400–1700	600–840	366–513	590–700	780–1056	706–1032	1392–1736	496–592	554–756	2320–2670	820–1090	806–1008	865–950	1.7–2.7	1.2–2.3	1.4–2.4	0.9–1.9	1.1–1.6	1.5–2.7	1.4–3.8	2.4–4.5	1.1–1.8	3–10.2	1.5–3.1	1.3–1.9	2.7–5	0.8–1	2–3.5	152–216	156–179	180–208	152–160	320–400	232–256	136–160	200–232	240–280	120–136	95–119	400–450	250–280	183–220	150–170	70–110	78–101	70–96	72–88	100–120	104–120	75–104	80–100	100–128	64–80	56–73	200–210	130–150	92–110	75–80	15X5	–
Smaller group	–

alternate hydrothecae. It is also the Acrytolaria species with the largest nematocysts (cf. Table XV ). Distribution Acryptolaria tortugasensis is only known from Tortugas , Florida , USA . Key to the known species of Acryptolaria ( A. andersoni excluded) 1. Hydrothecae abruptly abcaulinarly curved............ 2 – Hydrothecae homogeneously abcaulinarly curved......... 4 2. Hydrotheca curved once............. A. rectangularis – Hydrotheca curved twice. Abcauline wall with a sharp invagination at approxi- mately half of its length................. 3 3. Adcauline wall with a strong invagination at approximately half of its length..................... A. angulata – Adcauline wall without that invagination......... A. bulbosa 4. Diameter of hydrothecae clearly smaller at adnate part........ 5 – Diameter of hydrothecae more or less constant throughout....... 9 5. Basal part of hydrothecae bottleneck-shaped......... A. gracilis – Diameter of hydrothecae in adnate part decreasing towards hydrothecal base (hydrothecae horn-shaped)................ 6 6. Hydrotheca large. Diameter at aperture.300 Mm...... A. corniformis – Diameter at aperture,300 Mm............... 7 7. Half of adcauline hydrothecal wall adnate to internode. Free adcauline wall more or less straight................. A. longitheca – Two-thirds of adcauline wall adnate. Free adcauline wall convex..... 8 8. Length of abcauline hydrothecal wall,1000 Mm. Length of larger nematocysts.19 Mm.................... A. conferta – Length of abcauline hydrothecal wall.1000 Mm. Length of larger nematocysts,17 Mm.................. A. crassicaulis 9. Diameter of hydrothecal aperture up to 160 Mm.......... 10 – Diameter of hydrothecal aperture larger............ 12 10. Length of adcauline hydrothecal wall.1000 Mm....... A. flabellum – Hydrothecae tiny. Length of adcauline hydrothecal wall,800 Mm... 11 11. Four-fifths of hydrothecal adcauline wall adnate. Length of larger nematocysts.25 Mm.................... A. minima – Two-thirds of hydrothecal adcauline wall adnate. Length of larger nematocyst,19 Mm.................... A. minuta 12. Hydrothecae alternate in two planes............. 13 – Hydrothecae alternate in one plane.............. 14 13. Hydrothecae with an abcauline internal cusp. Length of larger nematocysts.28 Mm................... A. tortugasensis – Hydrothecae without cusps. Length of larger nematocysts,15 Mm.................... A. operculata 14. Two-thirds of hydrothecal adcauline wall adnate. Length of larger nematocyst,12 Mm.................... A. abies – Three-quarters to four-fifths of adcauline wall adnate. Length of larger nematocysts.20 Mm............... A. pulchella