Atractomorpha is a genus in the Sphaeropleaceae, a family of green algae.[1] The genus name is derived from Greek and means "spindle-shaped" or "arrow-shaped",[2] and refers to the shape of the cells.[3]
Atractomorpha consists of solitary cells. Cells are variable in size, but range from 25 μm to 6 mm in length. They are usually spindle-shaped, with two sharply pointed ends, but sometimes may develop three- or four-pointed cells. Cells are initially uninucleate (with one cell nucleus), but as the cell develops it becomes multinucleate; the cytoplasm is separated by large vacuoles into zones each containing chloroplasts and nuclei. Chloroplasts are ring-shaped bands or diffusely net-like.[3]
Reproduction in Atractomorpha occurs asexually or sexually. In asexual reproduction, zoospores develop from vegetative cells, or less commonly aplanospores. Zoospores are relatively large, initially spindle-shaped but becoming pyriform or ovate. They are biflagellate but lose their flagella after setting, at which point they develop into vegetative cells.[3] In sexual reproduction, gametangia develop from vegetative cells; they may be separate male or female gametangia, or in one species, bisexual.[4] Male gametes are biflagellate,[3] and female gametes are biflagellate or non-flagellate, depending on the species.[5] The resulting zygotes from fertilization are initially surrounded by a thin membrane, later developing a thick wall and often an orange-red color.[3]
Two species of Atractomorpha are known, Atractomorpha echinata and Atractomorpha porcata. The two present similar vegetative cells, but can be distinguished by their reproductive characteristics. Individual cells of A. echinata typically produce either male or female gametes but not both, while cells A. porcata produces both male and female gametes.[5] Additionally, A. echinata is typically anisogamous while A. porcata is typically oogamous, and their zygote walls have different ornamentations.[5]
Habitatedit
Atractomorpha has been recorded only a few times, mainly from soil isolates.[3] It occurs in shallow, temporary freshwater pools, and has been recorded from California, Texas, Australia, Namibia,[4] and Hungary.[6]
^ abcdefHoffman, Larry R. (1983). "Atractomorpha echinata gen. et sp. nov., a new anisogamous member of the Sphaeropleaceae (Chlorophyceae)". Journal of Phycology. 19 (1): 76–86. Bibcode:1983JPcgy..19...76H. doi:10.1111/j.0022-3646.1983.00076.x. S2CID 83546430.
^ abGuiry, M.D.; Guiry, G.M. "Atractomorpha". AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. Retrieved 2023-12-16.
^ abcHoffman, Larry R. (1984). "Atractomorpha porcata sp. nov., a new membr of the Sphaeropleaceae (Chlorophyceae) from California". Journal of Phycology. 20 (2): 225–236. Bibcode:1984JPcgy..20..225H. doi:10.1111/j.0022-3646.1984.00225.x. S2CID 84583201.
^Schmidt, A.; Fehér, G.; Padisák, J. (2003). "Some rare green algae occurring in the Danube river and its dead-and side-branches in southern Hungary". Biologia, Bratislava. 58 (4): 475–481.
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atractomorpha, alga, atractomorpha, genus, sphaeropleaceae, family, green, algae, genus, name, derived, from, greek, means, spindle, shaped, arrow, shaped, refers, shape, cells, atractomorpha, scientific, classification, unranked, viridiplantae, division, chlo. Atractomorpha is a genus in the Sphaeropleaceae a family of green algae 1 The genus name is derived from Greek and means spindle shaped or arrow shaped 2 and refers to the shape of the cells 3 Atractomorpha Scientific classification unranked Viridiplantae Division Chlorophyta Class Chlorophyceae Order Sphaeropleales Family Sphaeropleaceae Genus AtractomorphaL Hoffman Species Atractomorpha echinata Atractomorpha porcataDescription editAtractomorpha consists of solitary cells Cells are variable in size but range from 25 mm to 6 mm in length They are usually spindle shaped with two sharply pointed ends but sometimes may develop three or four pointed cells Cells are initially uninucleate with one cell nucleus but as the cell develops it becomes multinucleate the cytoplasm is separated by large vacuoles into zones each containing chloroplasts and nuclei Chloroplasts are ring shaped bands or diffusely net like 3 Reproduction in Atractomorpha occurs asexually or sexually In asexual reproduction zoospores develop from vegetative cells or less commonly aplanospores Zoospores are relatively large initially spindle shaped but becoming pyriform or ovate They are biflagellate but lose their flagella after setting at which point they develop into vegetative cells 3 In sexual reproduction gametangia develop from vegetative cells they may be separate male or female gametangia or in one species bisexual 4 Male gametes are biflagellate 3 and female gametes are biflagellate or non flagellate depending on the species 5 The resulting zygotes from fertilization are initially surrounded by a thin membrane later developing a thick wall and often an orange red color 3 Two species of Atractomorpha are known Atractomorpha echinata and Atractomorpha porcata The two present similar vegetative cells but can be distinguished by their reproductive characteristics Individual cells of A echinata typically produce either male or female gametes but not both while cells A porcata produces both male and female gametes 5 Additionally A echinata is typically anisogamous while A porcata is typically oogamous and their zygote walls have different ornamentations 5 Habitat editAtractomorpha has been recorded only a few times mainly from soil isolates 3 It occurs in shallow temporary freshwater pools and has been recorded from California Texas Australia Namibia 4 and Hungary 6 References edit See the NCBI webpage on Atractomorpha Data extracted from the NCBI taxonomy resources National Center for Biotechnology Information Retrieved 2007 03 19 Jaeger Edmund C 1959 A source book of biological names and terms Springfield Ill Thomas ISBN 0 398 06179 3 a b c d e f Hoffman Larry R 1983 Atractomorpha echinata gen et sp nov a new anisogamous member of the Sphaeropleaceae Chlorophyceae Journal of Phycology 19 1 76 86 Bibcode 1983JPcgy 19 76H doi 10 1111 j 0022 3646 1983 00076 x S2CID 83546430 a b Guiry M D Guiry G M Atractomorpha AlgaeBase World wide electronic publication National University of Ireland Galway Retrieved 2023 12 16 a b c Hoffman Larry R 1984 Atractomorpha porcata sp nov a new membr of the Sphaeropleaceae Chlorophyceae from California Journal of Phycology 20 2 225 236 Bibcode 1984JPcgy 20 225H doi 10 1111 j 0022 3646 1984 00225 x S2CID 84583201 Schmidt A Feher G Padisak J 2003 Some rare green algae occurring in the Danube river and its dead and side branches in southern Hungary Biologia Bratislava 58 4 475 481 nbsp This Chlorophyceae related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Atractomorpha alga amp oldid 1191653055, wikipedia, wiki, book, books, library,
